Pulley



March 16 1926. 1,577,032

F.J.KARG ErAL .PULLEY Filed Jan. 2s. 1924 MII l [Ill MINIMUM um muuu# Patented Mar. 16, 1926.

f, UNITED starts PATENT crema FRANLK KARG AND LEO HERMAN, OF TALLMADGE, OHIO, ASSIGNOES TO TI-IE HEB- MAN MACHINE AND TOOL COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO.

PULLEY.

A Application filed January 28, 1924:. SerialNo. 689,122. Y

To all whom it 'may concern:

Beit known thatrf'we, FRANK J. KARG and LEdHERiQIAN, Citizens of theV United States and residents of Tallmadge, county of Summit, State of Ohio, have invented certain new and useful Improvements in Pulleys, of which the following is a speciication. p

This invention relates to pulleys and has as its object the securing of certain advantages and improvements over pulleys at present in use. One of the purposes of the invention is to provide ka pulley having greater frictional properties than pulleys heretofore constructed, and to provide a pulley the surface of which is yielding so that it cannot be easily dented or injured. The invention also provides a pulley the surface of which, when heated, will have increased friction properties. rlhe pulley is also Waterproof, which isa decided improvement over the ordinary or well known paper pulley. Y

The objects which have been stated are obtained by the pulley construction herein shown and described, and other objects may be apparent to those skilled in the art. In carrying out the invention, however, it is not necessary that the details herein shown and described be followed as changes and modications may be made within the scope f of the appended claim.

In the drawings:

Figure l is a side view of a pulley construoted in accordance with the invention;

Figure 2 is a longitudinal section on the line 2 2 of Figure l;

Figure 3 is a'section on the line 3-3 of Figure 2, layers of the fabric being broken away to show certain details of the'V construction;

Figure et is a view looking at one end; and Figure 5 is a view looking at the opposite end.

The pulley shown herein is one such as used on motor shafts, but it is apparent that the invention is of general application. In the form shown there is provided the usual central .sleeve l which fits over the shaft and is provided with a leyway 2 over which is positioned the usual set screw 3. The ends of the sleeve are provided with teeth 4c within which tit the end plates 5, long posts or pins 6 being passed through the leld' Fltes andrfthlOrgh the bodyv thevffpulley and riveted over at their. eX- tremitiesto secure theplates together.v Onel` l,

end of `the sleeve is cored'out as at 7.

In the present pulley construction, the body is composed of a plurality of layers of rubberized fabric which have, preferably, been vulcanized. A convenient and eco.- nomical source of supply for the fabric is found in old tire casings, either of the cord or fabric type, although the invention is not necessarily limited to the use of this material as fresh fabric may be used. rI he layers of rubberized fabric are indicated by the numeral l0, cross woven fabric or canvas being indicated in Figure 3, although, as has been stated, other fabrics may be utilized for this purpose.

In the manufacture of the pulley, pieces of fabric slightlylarger than the size required are out from the sheets of material, with their centers removed and with openings for the pins 6. The required number of pieces are assembled about the central shaft and the pins and between the two end plates. Pressure is then applied to firmly compact the layers together with their faces in substantial contact and while so campacted the pins are riveted in position so that theV pulley presents a substantially firm outer surface. The pulley is then turned to the desired profile and a hole l1 bored out for. the admissionof the set screw. In assembling the layers of fabric, the pieces Will be so arranged that the threads thereof are at angles to one another indiscriminately, and are therefore presented at a great variety of angles to the surface of the pulley.

The pulley shown herein possesses many advantages over existing forms of pulleys as will be enumerated. The ends of all of the threads are presented to the surface of the pulley whichgreatly increases its frictional properties and its wear resisting qualities, both of which features are enhanced by the fact that these threads are at all angles to the surface due to the indiscriminate angular position of the fabric layers. 'The rubberized fabric is waterproof and will not break down or disintegratel if wet, which is a considerable advantage over paper pulleys in use at the present time. The pulley is inexpensive to manufacture, and while its surface is slightly yielding or resilent, it is irni, (lne to its having' been es senihlecl under presenre. The yielding snr face gives :L better belt Contact rindt in :i lcl i tion, Cannot he easily marred or dented. ln addition to this feature, when the pulley ie heated during operation, the rubber will soften slightly :incl ooze ont between the plies of fabric, Still further increasing its driving en pzieitlxi'.

Other objects and nil witziges will be apparent :from the description oil lthe invention and it "will he understood that changes and modilieutions may be rnade Within the Scope of the invention :is defined hereunder.

pregrnzi'erl, rubberized fnhrie, the layers beingj arranged in er variety of angular relations to one another so that threads of the lzibrie :ire presented eiitlwiee olI the pulley and the layers being;l held together by pres` eure between the end plates.

FRANK J. KARG. LEO HERMAN 

